The Medieval and Renaissance mss., 700-1600, consists of individual items acquired from time to time either as a gift or purchased from a variety of sources.
The Meigs mss., 1794–1831, cpnsists of letters and papers of Return Jonathan Meigs, 1764–1825, governor of Ohio, United States senator, and postmaster general during the administrations of Presidents James Madison and James Monroe.
The Calverley mss., 1359-18/19th cent., consist of Arabic manuscripts collected by Edwin Elliott Calverley, 1882-1971, professor of Arabic and Islamic studies, whose notes about the documents are occasionally found inscribed thereon.
The War of 1812 mss., 1776-1879, consists of individual items acquired separately either as a gift or purchase from a variety of sources, relating to the War of 1812.